Data restoration device and method for original CT projection data, CT imaging system

A technology for projection data and data restoration, which is applied in the field of X-ray imaging and can solve the problem that the quality of reconstructed images cannot be effectively improved.

Active Publication Date: 2022-06-21
GENERAL ELECTRIC CO
View PDF12 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional data compensation operations are all based on the interpolation within the detector column or the interpolation between the channels with the same opening angle between the columns, the quality of the reconstructed image can not be effectively improved, and it will be different for different scanned objects. exhibits good and bad characteristics

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Data restoration device and method for original CT projection data, CT imaging system
  • Data restoration device and method for original CT projection data, CT imaging system
  • Data restoration device and method for original CT projection data, CT imaging system

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0021] figure 1 This is a flowchart of a data restoration method for original CT projection data provided by the first embodiment of the present invention. Those skilled in the art can understand that the above-mentioned original CT projection data may be, for example, projection data collected from a detector channel of a CT imaging system, or may be projection data that has undergone some preprocessing after collection, and the preprocessing may include: For example, offset correction to remove dark current, reference channel correction to remove the toggle of the ray energy of each field of view, air correction to remove the inhomogeneity of the initial energy of each channel, beam hardening correction to remove high and low energy rays Absorptivity is inconsistent, -In mathematical transformation makes the data theoretically add meaning, etc.

[0022] figure 2 It is the original CT projection data obtained in an exemplary embodiment of the present invention. figure 2 ...

no. 2 example

[0050] Figure 4 This is a flowchart of a data restoration method for original CT projection data provided by the second embodiment of the present invention. The second embodiment is similar to the first embodiment, and the difference may be that: in the second embodiment, the above-mentioned second processing can also compare the steps S115 and matching line classification step S117.

[0051] Comparing step S115: comparing the data intensity at the data point corresponding to the texture direction information (for example, the direction line D1 and / or D2) matched with each matching line with the preset data intensity;

[0052] Matching line classification step S117: if the data intensity at the data point corresponding to the texture direction information matched with any matching line is greater than or equal to the preset data intensity, then the corresponding matching line is determined as the first matching line; otherwise , if the data intensity at the data point corres...

no. 3 example

[0057] Figure 5 This is a block diagram of a data restoration apparatus for original CT projection data provided by the third embodiment of the present invention. like Figure 5 As shown, in the third embodiment of the present invention, the data restoration apparatus for original CT projection data includes a region determination module 100 , and further includes at least one of a first processing module 200 and a second processing module 300 . in:

[0058] The region determination module 100 can be used to determine the region to be estimated and the credible region adjacent to the region to be estimated in the original CT projection data.

[0059] The first processing module 200 may include a data fitting unit 230 and a first estimation unit 250 . The data fitting unit 230 may be configured to perform data fitting on the CT projection data of the credible region to obtain a spatial surface equation. The first estimation unit 250 may be configured to re-estimate the CT ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The present invention provides a data restoration method for original CT projection data, including: determining the area to be estimated and the credible area adjacent to the area to be estimated in the original CT projection data; and performing the first processing and the second At least one of the processing. The first processing includes: performing data fitting on the CT projection data of the credible region to obtain a space surface equation; and reestimating the CT projection data of the region to be estimated according to the space surface equation. The second process includes: acquiring a plurality of texture direction information distributed in the credible region according to the CT projection data of the credible region; determining one or more matching lines in the region to be estimated according to each texture direction information, and each matching line The line passes through at least one data point to be estimated and is matched with at least one piece of texture direction information; an interpolation operation is performed along the matching line to re-estimate CT projection data of the area to be estimated.

Description

technical field [0001] The invention relates to the field of X-ray imaging, in particular to a data restoration method and device for original CT projection data, and a CT imaging system. Background technique [0002] In Computed Tomography (CT) medical imaging technology, the raw data collected from the detector is arranged into a two-dimensional matrix with the detector channel as the horizontal axis and the scanning field as the vertical axis, which is used as the original CT projection for image reconstruction. Data, also known as sinogram, is essentially a superimposition of curves formed by points on an image. For example, if the acquired CT projection data is reconstructed into an image with a size of 512*512, any point on the image, in the matrix of the original CT projection data, is a curved trajectory, and the amplitude of the curved trajectory depends on Depending on the distance from the point to the virtual acquisition rotation center, the greater the distance...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
CPCG06T5/005G06T2207/10081G06T2207/20221G01T1/29A61B6/032A61B6/5205G06T11/005
Inventor 王学礼曹蹊渺
Owner GENERAL ELECTRIC CO
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap